| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method of producing an R-Fe-B-based rare-earth sintered magnet by which grain boundary diffusion is completed in a shorter period of time than before, the amount of a heavy rare-earth element RH to be vaporized is reduced by shortening the time of the grain boundary diffusion, consequently the grain boundary diffusion of the heavy rare-earth element RH is efficiently carried out, and to provide the R-Fe-B-based rare-earth sintered magnet produced by the method. <P>SOLUTION: An R-Fe-B-based rare-earth sintered magnet body is prepared which contains, as a main phase, an R<SB>2</SB>Fe<SB>14</SB>B type compound crystal grains containing a light rare-earth element RL (at least one of Nd and Pr) as a main rare-earth element R. A pulverized body which contains the heavy rare-earth element RH (at least one selected from among Dy and Tb) and is pulverized by a hydrogen absorption method is disposed in a processing chamber together with the R-Fe-B-based rare-earth sintered magnet body, and heated to diffuse the heavy rare-earth element RH into the R-Fe-B-based rare-earth sintered magnet body while supplying the heavy rare-earth element RH to a surface of the R-Fe-B-based rare-earth sintered magnet body from the pulverized body. <P>COPYRIGHT: (C)2011,JPO&INPIT |
